Sitelinks are created through website best practices. The process of creating sitelinks may sound like website development 101. That's because the process of creating sitelinks is simply about following industry-standard practices in the creation and development of a site. Rad software

find shortcuts that will save users time and allow them to quickly find the information they're looking for. Sitelinks created automatically by an algorithm. Google says they “analyze the link structure of your site to find shortcuts.”

First one must know what a site link is before it can be established how it effects SEO. A site link is a special type of hyperlink to your website(s) that Google provides to help navigate the site itself. The automated Google algorithm adds the site links not the site owner. How does that effect SEO? The answer is preached all over this forum--There must be GOOD content of the site itself and proper back linking to the site. Think of it like this: Good content/Good back linking=Good SEO---Bad content/Bad back linking=Bad SEO.